Top executives from Detroit automakers met Monday with Vice President Mike Pence and other administration officials and aired their concerns about changes the Trump administration is seeking to the North American Free Trade Agreement.

Trump has pushed for companies to construct more auto assembly plants in the U.S., while also pushing for major changes to Nafta that the automakers oppose. U.S. negotiators have proposed significant changes to the so-called rules of origin for autos in a bid to ensure more U.S.-made parts are used in vehicles assembled in North America, a change that the auto industry has warned could undercut Trump’s America-first goals.

“We view the modernization of Nafta as an important opportunity to update the 23-year-old agreement and set the stage for an expansion of U.S. auto exports," Matt Blunt, a former Missouri governor who leads the American Automotive Policy Council, a trade association representing Ford Motor Co., General Motors Co., and Fiat Chrysler Automobiles NV said in a statement. "We also appreciate the opportunity to directly address the industry’s concerns with the administration’s rule of origin proposal."

Blunt said there are other things the group would like to have added to Nafta, including a provision to guard against currency manipulation by Mexico and Canada.

Fiat Chrysler Chief Executive Officer Sergio Marchionne, GM CEO Mary Barra and Joe Hinrichs, Ford’s president of global operations, attended the White House meeting. U.S. Trade Representative Robert Lighthizer and National Economic Council Director Gary Cohn were also scheduled to attend the meeting, Pence’s office said earlier on Monday.

Pence’s office issued a statement confirming the meeting and saying he emphasized "Trump’s commitment to enact historic tax cuts" and commitment to grow manufacturing in the U.S., reduce trade deficits and aid the car-making industry.